Works and Faith

So then they said to him, "What must we do to accomplish the deeds (works) God requires."  Jesus replied. "This is the deed God requires - to believe in the one whom he sent." [NET]

Then they said to him, how may we do the works of God? Jesus answering, said to them. This is to do the work of God, to have faith in him whom God has sent. [BBE]

So, the question here in John 6:28-29 could be:

What works do we have to do?    or

How do we do the works God does?

To either one the answer is the same. Believe [have faith in] in the one he [God] sent, Jesus Christ.